If you are a YouTube user, then you may have noticed the newly launched YouTube Video Editor, which lets you create videos using excerpts from the videos you've already uploaded.
Actually, YouTube launched an online Flash-based video editor called YouTube Remixer in 2007, but this Adobe Premiere Express based service was discontinued in a short time due to the slow speed and numberless bugs despite of offering features like transitions, captions, adding images to video.
So far things that you can do to your uploaded videos with this newly launched YouTube Video Editor including: AudioSwap, Annotate, place captions and subtitles and use the Cut/trim an uploaded video using the EDIT Clip feature.
To use the YouTube video editor, just login to your Youtube account. However, there are also many flaws during the editing for this newly launched Video Editor. For example:
1. You cannot add your own audio or music to your video.
2. You may receive advertisements when you used soundtracks from the AudioSwap library.
3. Since YouTube does not allow one to upload a video of more than 10 minutes duration, it is IMPOSSIBLE to upload a video longer than 10 minutes to edit.
4. Both the supported videos and edit options are too limited to meet many uses' basic needs.
Of course, you deserve a better choice, which can allow you to do whatever you would like to do to your YouTube videos. Are you still looking for such a kind of YouTube video editor? Aimersoft Video Editor is absolutely the very video editing tool that you are looking for. With this little gem of video editor, you can edit and produce any style videos with a few mouse clicks before uploading to YouTube.
1Load target videos
Load all your target video clips, can be in different formats, by dragging directly into the program. All the added files will be listed in the media library.
2Edit YouTube videos
Video Editor offers a huge palette of transitions, features, effects and editing options like splitting, merging, trimming, cropping, copying, and pasting and so on, which can give all the video processing power that you need.
3Upload to YouTube directly
Input your YouTube account information to upload the newly edited video from Video Editor to YouTube directly.
Note: If you are a YouTube enthusiast and often download video from YouTube, here you can go to learn how to edit downloaded YouTube (FLV) video.
What you need:
Video Studio Express 
Split, merge and crop videos regardless the video size and format.
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Video Studio Express for Mac 
A powerful video editor and converter owns both brilliant video editing
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good as a youtuber I need it to edit my videos :D